Patch originally from https://sources.debian.net/patches/erlang/1:20.0.1%2Bdfsg-2/man.patch/
by Francois-Denis Gonthier <neumann@lostwebsite.net>.

Patch description rewritten for Guix.

This patch allows access to the man page with the 'erl -man' command
(Erlang manual pages are placed to /gnu/store/..erlang../share/man/ hierarchy
as other man pages.)

--- a/erts/etc/common/erlexec.c
+++ b/erts/etc/common/erlexec.c
@@ -709,8 +709,10 @@
 			error("-man not supported on Windows");
 #else
 			argv[i] = "man";
-			erts_snprintf(tmpStr, sizeof(tmpStr), "%s/man", rootdir);
-			set_env("MANPATH", tmpStr);
+			/*
+			* Conform to erlang-manpages content.
+			*/
+			putenv(strsave("MANSECT=1:3:5:7"));
 			execvp("man", argv+i);
 			error("Could not execute the 'man' command.");
 #endif
/option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'>ght'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=6c04a8961fe15a6c856a2fb08ac39dab90d08be0'>refs</a><a class='active' href='/guix/log/gnu/packages/opencl.scm'>log</a><a href='/guix/tree/gnu/packages/opencl.scm?id=6c04a8961fe15a6c856a2fb08ac39dab90d08be0'>tree</a><a href='/guix/commit/gnu/packages/opencl.scm?id=6c04a8961fe15a6c856a2fb08ac39dab90d08be0'>commit</a><a href='/guix/diff/gnu/packages/opencl.scm?id=6c04a8961fe15a6c856a2fb08ac39dab90d08be0'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/opencl.scm'>
<input type='hidden' name='id' value='6c04a8961fe15a6c856a2fb08ac39dab90d08be0'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=6c04a8961fe15a6c856a2fb08ac39dab90d08be0'>root</a>/<a href='/guix/log/gnu?id=6c04a8961fe15a6c856a2fb08ac39dab90d08be0'>gnu</a>/<a href='/guix/log/gnu/packages?id=6c04a8961fe15a6c856a2fb08ac39dab90d08be0'>packages</a>/<a href='/guix/log/gnu/packages/opencl.scm?id=6c04a8961fe15a6c856a2fb08ac39dab90d08be0'>opencl.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/opencl.scm?id=6c04a8961fe15a6c856a2fb08ac39dab90d08be0&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-02-16 11:07:56 +0100'>2022-02-16</span></td><td><a href='/guix/commit/gnu/packages/opencl.scm?id=b545d223648e1575ce3fa9ac205a13f321cf318f'>gnu: opencl-icd-loader: Use single directory in search path.</a><span class='msg-avail'>...</span></td><td>Lars-Dominik Braun</td></tr>
<tr><td><span title='2022-02-01 23:46:04 +0100'>2022-02-01</span></td><td><a href='/guix/commit/gnu/packages/opencl.scm?id=4ed2b6ac38f536123dd102f30750e9396f6aeffd'>gnu: LLVM: Switch to 13 as the default.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-12-13 17:48:25 +0100'>2021-12-13</span></td><td><a href='/guix/commit/gnu/packages/opencl.scm?id=8394619baceb118df92e355377fd543bb1aa501a'>gnu: Simplify package inputs.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>